Add test for the specific bug, i.e. defining a new enzyme with at least 3 aa...

Add test for the specific bug, i.e. defining a new enzyme with at least 3 aa and cleaving site on the first one

tests/test_rule.py

@@ -35,7 +35,7 @@ def test_rule():
     # Test function '__eq__()'
     assert rule0 == rule2
 
-    # Complexe rule2
+    # complex rule2
     rule2.rules.append(rule1)
 
     # Test __repr__
@@ -329,7 +329,7 @@ def test_create_rules():
     assert truth2_2 in res
     assert len(res) == 3
 
-    # Other complexe rule
+    # Other complex rule
     # Don't cleaves after E if there is a D before
     # But cleaves after E otherwise
     rule3 = "(E,)"
@@ -347,7 +347,7 @@ def test_create_rules():
     assert truth3 in res
     assert len(res) == 4
 
-    # Similar complexe rule
+    # Similar complex rule
     # Cleaves after G if there is a F before
     # But don't cleaves after G otherwise
     rule4 = "(F)(G,)"
@@ -403,7 +403,7 @@ def test_create_rules():
     assert truth6_4 in res
     assert len(res) == 4
 
-    # Similar complexe rule
+    # Similar complex rule
     # Cleaves before G if there is a H after
     # But don't cleaves before G otherwise
     all_rules = {}
@@ -417,6 +417,22 @@ def test_create_rules():
     assert truth7 in res
     assert len(res) == 1
 
+    # Similar complex rule
+    # Cleaves before E if there is a E after and another E after
+    # But don't cleaves before E otherwise
+    all_rules = {}
+    rule8 = "(,E)(E)(E)"
+    all_rules[rule8] = True
+    # Truth for rule8
+    truth8_2 = rule.Rule(2, "E", True, -1)
+    truth8_1 = rule.Rule(1, "E", False, -1)
+    truth8 = rule.Rule(0, "E", False, 0)  # Don't cleaves after E
+    truth8_1.rules.append(truth8_2)
+    truth8.rules.append(truth8_1)
+    res = rule.create_rules(all_rules)
+    assert truth8 in res
+    assert len(res) == 1
+
 def test_handle_rule():
     """Test function 'handle_rule(seq, pos, a_rule, cleavage)'"""